Explaining The Universe on Instagram: "Follow (us) @ExplainingTheUniverse to learn something NEW every day 🧠 Contact lenses are made through a precise process using special plastics like hydrogel or silicone hydrogel. First, a tiny disc of the material is shaped using either lathe-cutting (where a machine carves the lens from a solid piece) or molding (where liquid plastic is poured into molds and cured with heat or UV light). The lenses are then polished, hydrated in a solution to make them so